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Disaster Recovery

Recover Ops Manager if the Operator Cluster Fails

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  • Recover the Kubernetes Operator and Ops Manager

In the event that the Kubernetes cluster hosting the Kubernetes Operator and the Ops Manager Application fails you can manually recover the operator cluster and the Ops Manager Application.

To restore the previous running state of Ops Manager, configure a periodic backup mechanism for your Ops Manager and Application Database resources. The Kubernetes Operator needs these resources to manage the Ops Manager Application deployment.

Recover the Kubernetes Operator and Ops Manager

To recover the Kubernetes Operator and Ops Manager, restore the Ops Manager resource on a new Kubernetes cluster:

1

Configure the Kubernetes Operator in a new cluster.

Follow the instructions to install the Kubernetes Operator in a new Kubernetes cluster.

Note

If you plan to re-use a member cluster, ensure that the appropriate service account and role exist. These values can overlap and have different permissions between the central cluster and member cluster.

To see the appropriate role required for the Kubernetes Operator, refer to the sample in the public repository.

2

Retrieve the backed-up resources from the failed Ops Manager resource.

Copy the object specification for the failed Ops Manager resource and retrieve the following resources, replacing the placeholder text with your specific Ops Manager resource name and namespace.

Resource Type
Values

Secrets

  • <om-name>-db-om-password

  • <om-name>-db-agent-password

  • <om-name>-db-keyfile

  • <om-name>-db-om-user-scram-credentials

  • <om-namespace>-<om-name>-admin-key

  • <om-name>-admin-secret

  • <om-name>-gen-key

  • TLS certificate secrets (optional)

ConfigMaps

  • <om-name>-db-cluster-mapping

  • <om-name>-db-member-spec

  • Custom CA for TLS certificates (optional)

OpsManager

  • <om-name>

Then, paste the specification that you copied into a new file and configure the new resource by using the preceding values. To learn more, see Deploy an Ops Manager Resource.

3

Re-apply the Ops Manager resource to the new cluster.

Use the following command to apply the updated resource:

kubectl apply \
  --context "$MDB_CENTRAL_CLUSTER_FULL_NAME" \
  --namespace "mongodb"
   -f https://raw.githubusercontent.com/mongodb/mongodb-enterprise-kubernetes/master/samples/ops-manager/ops-manager-external.yaml

To check the status of your Ops Manager resource, use the following command:

kubectl get om -o yaml -w

Once the central cluster reaches a Running state, you can re-scale the Application Database to your desired distribution of member clusters.

At this point, the newly restored Kubernetes Operator should pick up management of the existing Application Database.

  • The ConfigMap used to create the initial project.

  • The secrets used in the previous Kubernetes Operator instance.

  • The MongoDB or MongoDBMulticluster custom resource at its last available state on the source cluster, including any annotations added by the Kubernetes Operator during its lifecycle.

Note

If the Application Database replica set has lost some nodes and is unable to form a voting majority, forcibly reconfigure the replica set. This adds new replica set nodes that will form a voting majority allowing the replica set to elect a primary.

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Recover Lost Majority Replica Set